题目

About 698,000 laptops were sold in China in          second quarter,        12.1% in crease from a year ago.     A．a; a         B．the; a       C．the; the     D．a; the   答案：B序数词前用定冠词the, the second quarter“第二季度”，increase “增长率”用不定冠词修饰，表泛指意思是和去年相比增加了12.1%。  控制生物性状的最小单位叫做A．基因B．细胞C．细胞核D．染色体